Soon to be seen in Hairspray, Zac Efron graduates from Disney Channel cutie to leading man material. At the MTV Awards, Efron scores extra points for not taking the sloppy-actor route. Instead, he chooses a sleek Prada suit.

Never one to shy away from a bold beauty look, Rihanna debuts a bob cut with blunt bangs. The Covergirl spokeswoman tops off her new look with bubble-gum-pink lipstick and blue mascara. With a face like that, how could she go wrong?

With her Stella McCartney frock, newcomer Megan Fox adds a splash of color to the play-it-safe looks many actresses chose for the event. The Transformers star is sure to have designers clamoring to dress her for her upcoming premiere.

It was nice to see the Stomp the Yard star Meagan Good keep it real. Good adds a little street-style flavor to MTV’s pink carpet with her bamboo earrings and scores extra points for her ’70s Farrah Fawcett–style flip.

Going for the goddess look, Lauren Conrad (clad in Pamela Rolland) was the only celeb to take the dramatic evening-gown route. The Hills star balances her good-girl vibe with a flash of leg and sassy red nail polish.

Jessica Biel has one of the best bodies in Hollywood, but no girl wants to be a one-trick pony. Following an awards season of impeccable looks, Biel goes casual cool with a V-neck dress studded with grommet accents.

Cameron Diaz is like the best-dressed girl in school who you always wanted to hang out with but were too afraid to ask. Showing off her mile-long legs in a minidress, Diaz finishes off her look with sky-high pumps and a studded clutch.

Actress-singer Amanda Michalka was the best-dressed star of the young Hollywood set. Wearing a simple white dress, Michalka finishes off her understated look with Christian Louboutin slingbacks.